To use this extension, enable the "Dev: TokenXY" extension on the load screen of the campaign you are testing in.

For the TokenXY extension, click the red tool button that has been added to the stack of buttons on the top right of the desktop. This opens a window. Leave the window open and open an image window. The image grid information will be displayed in the window. Drag a new token onto an image window and then click it. The tokens X and Y location will be displayed in the TokenXY window. You can move the token around and each time you click the X and Y location will be updated.